How to get Hero of Marleybones Badge

Hello everyone, I am on level 40 Pyromancer and when I finished Marleybone between levels 34-35, I defeated the Big Ben, so I went to headmaster Ambrose and he gave me the keys to Mooshu, but I noticed that I have'nt got the badge hero of marleybone I dont get; whats up with that

Hello everyone, I am on level 40 Pyromancer and when I finished Marleybone between levels 34-35, I defeated the Big Ben, so I went to headmaster Ambrose and he gave me the keys to Mooshu, but I noticed that I have'nt got the badge hero of marleybone I dont get; whats up with that

Maybe you can check this list that shows Marleybone quests, and you might find something you missed: